// A simple program that computes the square root of a number
#include <cmath>
#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

int main(int argc, char* argv[])
{
    if (argc < 2){
        std::cout << "Usage: " << argv[0] << " number" << std::endl;
        return 1;
    }
    
    const double inputValue = atof(argv[1]);
    const double outputValue = sqrt(inputValue);
    std::cout << "The square root of " << inputValue << " is " << outputValue << std::endl;

    return 0;
}
